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#include <stdio.h> #include <math.h> #include <complex.h> int main(void) { double PI = acos(-1); double complex n = cexp(I * PI); printf("exp(i*pi) = %.1f%+.1fi\n", creal(n), cimag(n)); return 0; } /* run: exp(i*pi) = -1.0+0.0i */